Industrial equipment

ABSTRACT

An industrial equipment includes a cavity configured to store a coolant, and a cooling acceleration device which is accommodated in the cavity and is put in the coolant stored in the cavity. The cooling acceleration device includes a passage formation portion in which a tubular passage extending in a horizontal direction is formed, and an introduction portion configured to introduce molten material dropped into the cavity to the passage formation portion.

BACKGROUND OF THE INVENTION Field of the Invention

The present invention relates to an industrial equipment having a function of cooling a molten material such as a metal.

Priority is claimed on Japanese Patent Application No. 2017-231002, filed Nov. 30, 2017, the content of which is incorporated herein by reference.

Description of Related Art

In factory equipment or the like for processing a metal, an operation of cooling a high-temperature molten metal by exposing the molten metal to the atmosphere or by dipping the molten metal in a coolant stored in a cavity is performed. For example, a technique for accelerating diffusion of the molten material in water and enhancing a cooling effect is disclosed in Japanese Unexamined Patent Application, First Publication No. 2010-266286.

When a high-temperature molten material is dropped into a cavity or the like in which a coolant is stored, since the molten material freely spreads on a floor surface, the range of contact with the coolant is enlarged, and a rough mixing (atomization of the molten material) phenomenon is promoted. As a result, in some cases, rapid boiling may occur, and countermeasures to prevent this are required.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide industrial equipment capable of preventing the rough mixing phenomenon from being accelerated when a high-temperature molten metal is cooled, and capable of suppressing the rapid boiling of water.

SUMMARY OF THE INVENTION

(1) According to an aspect of the present invention, an industrial equipment including: a cavity configured to store a coolant; and a cooling acceleration device which is accommodated in the cavity and is put in the coolant stored in the cavity, wherein the cooling acceleration device includes: a passage formation portion in which a tubular passage extending in a horizontal direction is formed; and an introduction portion configured to introduce molten material dropped into the cavity to the passage formation portion. (2) In the industrial equipment described above, the industrial equipment further includes a vessel configured to drop drops of molten material, wherein the cavity is positioned below the vessel, the cooling acceleration device is accommodated in the cavity and is below the vessel, and the molten material dropped from the vessel into the cavity is introduced to the passage formation portion via the introduction portion. (3) In the industrial equipment described above, a cross-sectional area of the passage formation portion, is perpendicular to a bottom surface of the passage formation portion, may be 2000 mm² or more and 20000 mm² or less. (4) In the industrial equipment described above, in a cross section of the passage formation portion perpendicular to an extending direction thereof, a horizontal length of the cross section may be 1 to 200 times a vertical length of the cross section. (5) In the industrial equipment described above, the introduction portion may be a through hole formed in a side wall of the passage formation portion facing the vessel. (6) In the industrial equipment described above, a plurality of the through holes may be formed so as to be aligned in the extending direction of the passage formation portion. (7) In the industrial equipment described above, a plurality of passage formation portions may be installed in the industrial equipment so as to be aligned side by side in a width direction thereof. (8) In the industrial equipment described above, the plurality of passage formation portions may be stacked in the vertical direction. (9) In the industrial equipment described above, a ceiling portion of the passage formation portion may be provided with a plurality of protrusions formed inside the passage formation portion. (10) In the industrial equipment described above, a floor portion of the passage formation portion may be provided with a protrusion formed inside the passage formation portion. (11) In the industrial equipment described above, a covering member may be installed on a top of the passage formation portion existing at the highest position in the vertical direction. (12) In the industrial equipment described above, a protruding portion may be formed on a top of the passage formation portion existing at the highest position in the vertical direction.

As described above, the industrial equipment according to the present invention is configured so that the molten material is dropped into a tubular passage storing the coolant. After the molten material is dropped, a space surrounded by the side walls of the passage is in a state in which the molten material accumulates on the lower area of the space, and water accumulates on the upper area of the space. In this case, since the diffusion of the molten material in the horizontal direction is restricted, a contact area of the molten material with the water is smaller than in a case where the same amount of the molten material is not accommodated in the passage and spreads to diffuse on the floor surface. Therefore, it is possible to reduce the ratio of one portion of the molten material, which is coming into contact with the water and roughly mixing therewith, with respect to the other portion of the molten material accommodated in the passage, and thereby rapid boiling of the water can be suppressed.

In addition, in the industrial equipment according to the present invention, since the molten material is accommodated in the narrow space in the passage, heat of the molten material is held in the passage, and the temperature of the water stored in the same space rapidly rises. Therefore, the interior of the passage is in a vapor-rich state, and generation of new steam which is a cause of shock wave generation does not easily occur, and as a result, rapid boiling of the water can be further suppressed.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a cross-sectional view schematically illustrating a configuration of industrial equipment according to a first embodiment of the present invention.

FIG. 2A is an enlarged perspective view illustrating a configuration of a cooling acceleration device of the industrial equipment of FIG. 1.

FIG. 2B is a cross-sectional view when the cooling acceleration device of FIG. 2A is cut perpendicular to an extending direction of a passage formation portion.

FIG. 3A is a perspective view schematically illustrating a configuration of industrial equipment according to a second embodiment of the present invention.

FIG. 3B is a perspective view schematically illustrating a configuration of industrial equipment according to a first modified example of the second embodiment of the present invention.

FIG. 4 is a cross-sectional view schematically illustrating a configuration of industrial equipment according to a third embodiment of the present invention.

FIG. 5 is a top view schematically illustrating the configuration of industrial equipment according to the third embodiment of the present invention.

FIG. 6 is a cross-sectional view schematically illustrating a configuration of industrial equipment according to a fourth embodiment of the present invention.

FIG. 7 is a cross-sectional view schematically illustrating a configuration of industrial equipment according to a fifth embodiment of the present invention.

FIG. 8 is a cross-sectional view schematically illustrating a configuration of industrial equipment according to a sixth embodiment of the present invention.

FIG. 9 is a perspective view schematically illustrating a configuration of industrial equipment according to a seventh embodiment of the present invention.

FIG. 10 is a perspective view schematically illustrating a configuration of industrial equipment according to an eighth embodiment of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

Hereinafter, industrial equipment according to an embodiment to which the present invention is applied will be described in detail with reference to the drawings. In the drawings used in the following description, for the sake of easy understanding of the features, there are cases where characteristic portions are illustrated to be enlarged for convenience, and the dimensional ratio of each component is not necessarily the same as the actual ratio. Further, the materials, dimensions, and the like exemplified in the following description are examples, but the present invention is not limited thereto, and can be carried out with appropriate changes within a scope that does not change the gist thereof.

First Embodiment

FIG. 1 is a cross-sectional view of industrial equipment 100 according to a first embodiment of the present invention. The industrial equipment 100 includes a vessel 101 in which a molten material M such as a metal is stored, a cavity 102 which is positioned below the vessel 101 and in which a coolant W such as water is stored, and a cooling acceleration device 103 which is accommodated in the cavity 102 to be below the vessel 101 and positioned so as to be put in the coolant W stored in the cavity 102.

The vessel 101 is configured so that the molten material M stored in the cavity 102 can be dropped to the outside therefrom. Although a shape of the vessel 101 is not limited, a hole 101 a through which the dropped molten material M passes is formed at a position which is a bottom portion. The position of the hole 101 a is not limited either, but from the viewpoint of preventing the local residue of the molten material M, the position is preferably the lowest point of the vessel 101.

The cavity 102 is configured so that at least the vessel 101 side is opened and the molten material M dropped from the vessel 101 is introduced to the inside of the cavity 102. It is preferable that the coolant W be stored at least to a depth at which the cooling acceleration device 103 is submerged. In other words, it is preferable that a liquid level of the coolant W be located at a position which is higher than an upper end of the cooling acceleration device 103 and close to the upper end.

FIG. 2A is an enlarged perspective view illustrating a configuration of the cooling acceleration device 103 of FIG. 1. The cooling acceleration device 103 has a passage formation portion 104 in which a tubular passage extending in a substantially horizontal direction, and an introduction portion 105 through which the molten material M is introduced to the passage formation portion 104.

The passage formation portion 104 is in a state in which at least an end portion 104 b, which is a downstream side of the passage, opens, and the coolant W in the cavity 101 can always enter and exit the passage formation portion 104.

From the viewpoint of guiding the molten material M dropped into the passage formation portion 104 to flow toward the downstream side (that is close to the end portion 104 b) along the passage, an end portion 104 c, which is an upstream side of the passage formation portion 104, is preferably occupied by a wall. Further, from the same viewpoint, it is preferable that a bottom surface of the passage formation portion 104 be inclined to become lower toward the end portion 104 b.

The form of the introduction portion 105 is not particularly limited. However, for example, it is possible to provide a through hole formed in a side wall of the passage formation portion 104, to which the molten material M is dropped from the vessel 101, facing the vessel 101 (the upper side of the passage formation portion 104, in FIG. 2A). The shape and dimensions of the through hole are determined in consideration of viscosity of the molten material M.

It is preferable that an area of a cross section S₁ of the passage formation portion 104, is perpendicular to a bottom surface 104 a, be 2000 mm² or more and 20000 mm² or less. If the area of the cross section S₁ is less than 2000 mm², it is difficult to sufficiently cool the molten material M. Also, if the area of the cross section S₁ exceeds 20000 mm², a ratio of the portion which comes into contact with the coolant and is roughly mixed increases, and as a result, rapid boiling of water easily occurs. Further, the bottom surface 104 a of the passage formation portion of the present embodiment is one of the inner wall surfaces of the passage formation portion 104, which is located lower side in the vertical direction with respect to the other, in a state where the passage formation portion 104 is installed in the cavity 102.

FIG. 2B is a cross-sectional view when the passage formation portion 104 of FIG. 2A is cut along a plane perpendicular to an extending direction (a longitudinal direction) L thereof. Regarding the cross-sectional shape of the passage, a rectangular shape is exemplified here, but the cross-sectional shape is not limited thereto and may be another polygonal shape or a circular shape. However, from the viewpoint of stably installing on the bottom surface 102 a of the cavity 102, it is preferable that the portion coming into contact with the bottom surface 102 a of the cavity be flat.

It is preferable that a cross section S₂ of the passage formation portion 104, is perpendicular to an extending direction L, be vertically elongated. Specifically, in the cross section S₂, a maximum horizontal length D₂ of the cross section is preferably 1 to 200 times a maximum vertical length D₁ of the cross section.

As described above, the industrial equipment 100 according to the present embodiment is configured so that the molten material M is dropped into a tubular passage 104 storing the coolant W. After the molten material M is dropped, a space surrounded by the side walls of the passage is in a state in which the molten material accumulates on the lower area of the space, and water accumulates on the upper area of the space. In this case, since the diffusion of the molten material M in the horizontal direction is restricted, a contact area of the molten material M with the coolant W is smaller than in a case where the same amount of the molten material M is not accommodated in the passage and spreads to diffuse on the floor surface. Therefore, it is possible to reduce the ratio of one portion of the molten material M, which is coming into contact with the coolant W and roughly mixing therewith, with respect to the other portion of the molten material M accommodated in the passage, and thereby rapid boiling of the coolant W can be suppressed.

In addition, in the industrial equipment 100 according to the present embodiment, since the molten material M is accommodated in the narrow space in the passage formation portion 104, heat of the molten material M is held in the passage formation portion 104, and the temperature of the coolant W stored in the same space rapidly rises. Therefore, the interior of the passage formation portion 104 is in a vapor-rich state, and generation of new steam, which is a cause of shock wave generation, does not easily occur, and as a result, rapid boiling of the coolant W can be further suppressed.

Second Embodiment

FIG. 3A is an enlarged perspective view illustrating a configuration of a cooling acceleration device 203 in the industrial equipment according to the second embodiment of the present invention. The cooling acceleration device 203 of the present embodiment includes a plurality of passage formation portions 204. The plurality of passage formation portions 204 are arranged side by side in the width direction so that their extending directions L are parallel to each other. Each of the passage formation portions 204 is provided with an introduction portion 205, similarly to the cooling acceleration device 103 of the first embodiment. From the viewpoint of introducing the molten material M to be dropped into the passage formation portion 204 without leaking, it is preferable that the adjacent passage formation portions 204 be arranged in close contact with each other without gaps, and the side walls may be shared. The configurations of the industrial equipment according to this embodiment other than the cooling acceleration device 203 are the same as those of the industrial equipment 100 according to the first embodiment.

The configuration of each of the passage formation portion 204 and the introduction portion 205 is the same as that of the passage formation portion 104 and the introduction portion 105 in the first embodiment, and in the cooling acceleration device 203 of this embodiment, at least the same effect as that of the cooling acceleration device 103 of the first embodiment can be obtained.

Furthermore, since the plurality of passage formation portions 204 are arranged, even when, for example, the position at which the molten material M is dropped is not specified, it is possible to introduce the molten material M into any one of the passage formation portions 204 with a high probability as compared with a case where only one passage formation portion 204 is disposed. Therefore, it is possible to prevent a situation in which the dropped molten material M is not introduced into any of the passage formation portions 204 and comes into contact with the coolant W outside the cooling acceleration device 203, and it is possible to prevent the occurrence of the rapid boiling of the coolant W with contact.

First Modified Example

FIG. 3B is a perspective view schematically illustrating a configuration of a cooling acceleration device 213 of the industrial equipment according to the first modified example of the second embodiment of the present invention. In this example, a plurality of introduction portions 215 may be provided on a surface on the vessel side of a passage formation portion 214 in the extending direction L of the passage. The plurality of introduction portions 215 may be arranged at regular intervals in the extending direction L or may be randomly arranged. In this case, it is possible to further increase the probability that the molten material M can be introduced into any one of the passage formation portions 214, as compared with the case where the introduction portion 215 is provided one by one in the passage formation portion.

Third Embodiment

FIG. 4 is an enlarged cross-sectional view illustrating a configuration of a cooling acceleration device 303 installed in a cavity 302 storing the coolant W, in industrial equipment according to a third embodiment of the present invention. The cooling acceleration device 303 of the present embodiment has a structure in which a plurality of passage formation portions 304 are provided in the vertical direction (a height direction) H by stacking a plurality of plate-like members 306 in order from the bottom 302 a of the cavity. In FIG. 4, a case where the passage formation portions 304 are stacked in two stages is illustrated as an example, but three or more stages may be stacked. The configurations of the industrial equipment according to the present embodiment other than the cooling acceleration device 303 are the same as those of the industrial equipment 100 according to the first embodiment.

FIG. 5 is an enlarged top view of the configuration of the cooling acceleration device 303. Except for the plate-like member 306 located at a lowermost position (a plate-like member at the position closest to the bottom 302 a), each plate-like member 306 has an introduction portion (hereinafter referred to as a through hole) 305 which guides the molten material M to a passage immediately below. The number of the through holes 305 is not limited. Through holes indicated by solid lines are provided in the first plate-like member 306 from the top, and through holes indicated by broken lines are provided after the second plate-like member from the top.

When the molten material M flowing on the plate-like member 306 reaches the position of the through hole 305, in some cases, the molten material M jumps over the opening region of the through hole 305 and collides with the inner wall on the back side of the through hole 305. In that case, there is a risk of the molten material M that has collided jumping up and flowing out to the outside of the cooling acceleration device 303.

In order to prevent the molten material M from flowing out, it is preferable that the through hole 305 have a shape diffusing in the direction in which the molten material M flows. As such a shape, it is possible to adopt, for example, an elliptical shape, a rectangular shape or the like formed so that the longitudinal direction is substantially parallel to the flow direction of the molten material M. From the viewpoint of increasing the length in the longitudinal direction and suppressing the opening area to the minimum, the elliptical shape is more preferable.

As illustrated in FIG. 4, the end portions or the intermediate portions of the passage formation portions 304 of the respective stages may be fixed with a plate-like member 307 or the like standing upright in the vertical direction. In this case, the strength of the passage formation portion 304 can be enhanced, and even if the coolant W rapidly boils, it is possible to protect the passage formation portion 304 from an impact caused by the rapidly boiling.

From the viewpoint of accelerating the flow of the molten material M to be introduced in the passage formation portion 304, the bottoms (a lower wall) of the plurality of passage formation portions are preferably inclined so that the downstream side becomes lower. The angle of inclination may be constant or may change continuously or intermittently. In FIG. 4, the case where the inclination angle of each stage changes intermittently once is shown as an example. That is, in each stage, a passage formation portion 304A with an inclination angle α is disposed on the downstream side, a passage formation portion 304B with an inclination angle β is disposed on the upstream side, and the inclination angle α of the downstream is smaller than the inclination angle β of the upstream side.

In the structure in which the passage formation portions 304 are stacked in the height direction H as in the present embodiment, the introduced molten material M flows to diffuse in the height direction (the depth direction) H in the passage due to the influence of gravity. Thus, the cooling can be performed without increasing the contact area with the coolant W.

In the case where the cooling acceleration device according to the above-described three embodiments is an integral structure, it is difficult to construct the cooling acceleration device in a space that is restricted by existing structures and the like, but in the case where the cooling acceleration device is a divisible structure, the cooling acceleration device can be assembled to avoid existing structures. For example, in the case where a plurality of pillars are standing in the execution space in a fence shape as an existing structure, even though the cooling acceleration device itself in its completed state is too large and does not pass between the pillars, divided small members can pass between the pillars. That is, it is possible to insert a plurality of divided members from between the pillars and carry them in a predetermined position by rotating them or the like, and a predetermined cooling acceleration device can be assembled between the carried members.

Fourth Embodiment

FIG. 6 is an enlarged cross-sectional view illustrating a configuration of a part of a cooling acceleration device 403 installed in a cavity storing the coolant, in the industrial equipment according to the fourth embodiment of the present invention. In the cooling acceleration device 403 of the present embodiment, a plate-like member (a ceiling portion) 406 serving as a ceiling of each passage formation portion 404 is provided with a plurality of corrugated protrusions (sleeves) 408, each of which is protruded inside the passage formation portion 404 (that is close to the floor), formed. The configurations of the industrial equipment according to this embodiment other than the protrusion 408 are the same as those of the industrial equipment according to the third embodiment.

The protrusion 408 can be formed, for example, by attaching a plurality of other plate-like members to the plate-like member 406. There are no restrictions on the attaching directions, but as illustrated in FIG. 6, for example, the plate-like members may be attached to be aligned in parallel to each other (so that the main surfaces are opposite to each other) or may be attached to form a cross (with the main surfaces and the side surfaces opposite to each other). The protrusion 408 may be integral with or separate from the plate-like member 406. The configurations of the industrial equipment according to this embodiment other than the protrusion 408 are the same as those of the cooling acceleration device 303 according to the third embodiment.

The protrusion 408 functions as a pocket of steam generated with the inflow of the molten metal, and has a structure in which the steam does not easily escape to the outside. When the coolant flows into each passage formation portion 404 for the first time, steam is accumulated between the protrusions 408. In order to enhance the pocket function of the steam, it is preferable that the protrusion 408A near the introduction portion (the through hole) 405 be longer in the protruding direction than the other protrusion 408B.

In such a configuration, the interior of the passage formation portion 404 is in a vapor-rich state, generation of new steam, which is a cause of generation of a shock wave, does not easily occur, and as a result, rapid boiling of the coolant can be further suppressed.

Fifth Embodiment

FIG. 7 is an enlarged cross-sectional view illustrating a configuration of a part of a cooling acceleration device 503 installed in a cavity storing the coolant in industrial equipment according to a fifth embodiment of the present invention. In the cooling acceleration device 503 of the present embodiment, a plate-like member (a floor portion) 506, which is the floor of each passage formation portion 504, is provided with a corrugated protrusion (a sleeve) 509, which is protruded inside the passage formation portion 504 (that is close to the floor), formed at a predetermined position of the plate-like member. The number of protrusions 509 is not limited. In the present embodiment, a plurality of corrugated protrusions may be provided on the inner side (the floor side) of the plate-like member 506 serving as the ceiling of each passage formation portion 504 as in the fourth embodiment. The configurations of the industrial equipment according to this embodiment other than the protrusion 509 are the same as those of the industrial equipment according to the third embodiment.

The protrusion 509 can be formed by, for example, attaching another plate-like member to the plate-like member 506. It is preferable that the attachment be performed so that the main surface of the plate-like member is substantially perpendicular to the flowing direction of the molten material. The protrusion 509 may be integral with or separate from the plate-like member 506.

The protrusion 509 functions as a sacrificial material for partitioning the flow of the molten material M for a predetermined time. For example, as illustrated in FIG. 7, in the case where the protrusion 509 is attached in front of the region R immediately below the through hole 505 in a traveling direction D of the molten material introduced into the passage formation portion 504, it is possible to prevent the steam from flowing out to the outside through the hole 505.

Examples of the material of the protrusions 509 include silica, calcium, iron, and the like. By adjusting the number and position of the protrusions 509, since it is possible to limit the amount of the coolant allocated to each passage formation portion 504, high voids can be achieved in a short time, the rough mixing phenomenon is prevented from being accelerated, and it is possible to suppress the rapid boiling of water.

The protrusion 509 melts into the molten material when the protrusion 509 comes into contact with the molten material and a predetermined time passes. The molten protrusion 509 lowers the viscosity of the molten material and diffuses between the passage formation portions, and thus becomes an effective component in a subsequent long-term cooling process.

Sixth Embodiment

FIG. 8 is an enlarged cross-sectional view illustrating a configuration of a part of a cooling acceleration device 603 installed in a cavity storing the coolant in the industrial equipment according to a sixth embodiment of the present invention. In the cooling acceleration device 603 of the present embodiment, a covering member 610A (610) is installed on a top of a plate-like member (hereinafter also referred to as a top plate) 606A serving as a ceiling section of a passage formation portion 604 at the highest position in the vertical direction H, avoiding the position of the through hole 605. The covering member 610A is made of a material having excellent heat resistance including zirconia or the like. The configurations of the industrial equipment according to this embodiment other than the covering member 610 are the same as those of the industrial equipment according to the third embodiment.

Since the covering member 610A is installed, the occurrence of ablation (loss) in the top plate 606A can be prevented when a high-temperature molten material M flows. In the case of thinly diffusing the molten material in the cavity, a layer of alkaline concrete such as silica and calcium may be installed on the covering member 610A to lower the viscosity of the molten material.

In a plate-like member (a lower plate) 606B below the top plate 606, it is preferable that a covering member 610B also be provided at a position overlapping the position of the through hole 605 of the top plate 606. In this case, it is possible to prevent a situation in which the molten material M dropping from the through hole 605 collides with the lower plate and bores a hole at that place.

Seventh Embodiment

FIG. 9 is an enlarged perspective view illustrating a configuration of an upper surface of a cooling acceleration device 703 of the industrial equipment according to a seventh embodiment of the present invention. In the cooling acceleration device 703, in preparation for a case where the liquid level of the coolant is higher than the top plate (the plate-like member) 706A, a plate-like protruding portion (a vertical plate) 711 is installed on the top plate 706A. A main surface 711 a of the protruding portion 711 is substantially parallel to the vertical direction. The protruding portion 711 may be integral with or separate from the top plate 706. The configurations of the industrial equipment according to this embodiment other than the protruding portion 711 are the same as those of the industrial equipment according to the third embodiment.

Since the protruding portion 711 is disposed on the top plate 706A, even when the molten material flows over the top plate 706A, since the diffusing range of the molten material is narrowed, the rough mixing phenomenon is prevented from being accelerated, and it is possible to suppress the rapid boiling of water.

Eighth Embodiment

FIG. 10 is an enlarged cross-sectional view illustrating a configuration of a part of a cooling acceleration device 803 installed in a cavity storing the coolant in the industrial equipment according to an eighth embodiment of the present invention. In the cooling acceleration device 803 of the present embodiment, a lid member 812 made of a low-melting-point material is installed to be buried in a through hole portion of the top plate 806A. The configurations of the industrial equipment according to this embodiment other than the lid member 812 are the same as those of the industrial equipment according to the third embodiment.

Since the lid member 812 is made of a material that melts when it comes into contact with the molten material, the molten material that tries to pass through the lid member 812 melts the lid member 812, and falls from the melted hole (the through hole) to the lower stage and flows down. The lid member 812 that remains without being melted plays a role of blocking the outlet of the steam in the cooling acceleration device 803, and it is possible to increase the temperature of the coolant.

While preferred embodiments of the invention have been described and illustrated above, it should be understood that these are exemplary of the invention and are not to be considered as limiting. Additions, omissions, substitutions, and other modifications can be made without departing from the spirit or scope of the present invention. Accordingly, the invention is not to be considered as being limited by the foregoing description, and is only limited by the scope of the appended claims.

EXPLANATION OF REFERENCES

-   -   100 INDUSTRIAL EQUIPMENT     -   101 VESSEL     -   101A HOLE OF VESSEL     -   102, 302 CAVITY     -   102A BOTTOM SURFACE OF CAVITY     -   103, 203, 213, 303, 403, 503, 603, 703 COOLING ACCELERATION         DEVICE     -   104, 204, 214, 304, 304A, 304B, 604 PASSAGE FORMATION PORTION     -   804 PASSAGE FORMATION PORTION     -   104 a, 304 a BOTTOM SURFACE OF PASSAGE FORMATION PORTION     -   104 b, 104 c END PORTION OF PASSAGE FORMATION PORTION     -   105, 205, 215, 305, 605 INTRODUCTION PORTION (THROUGH HOLE)     -   306, 307, 406, 606, 606A, 606B, 706A PLATE-LIKE MEMBER     -   806, 806A PLATE-LIKE MEMBER     -   408, 408A, 408B, 509, 711 PROTRUSION     -   610, 610A, 610B COVERING MEMBER     -   711A MAIN SURFACE OF PROTRUDING PORTION     -   812 LID MEMBER     -   D TRAVELING DIRECTION OF MOLTEN MATERIAL     -   L EXTENDING DIRECTION OF PASSAGE FORMATION PORTION     -   M MOLTEN MATERIAL     -   R REGION DIRECTLY UNDER THROUGH HOLE     -   W COOLANT 

What is claimed is:
 1. An industrial equipment, comprising: a cavity configured to store a coolant; and a cooling acceleration device which is accommodated in the cavity and is put in the coolant stored in the cavity, wherein the cooling acceleration device includes: a passage formation portion in which a tubular passage extending in a horizontal direction is formed; and an introduction portion configured to introduce molten material dropped into the cavity to the passage formation portion.
 2. The industrial equipment according to claim 1, further comprising a vessel configured to drop drops of molten material, wherein the cavity is positioned below the vessel, the cooling acceleration device is accommodated in the cavity and is below the vessel, and the molten material dropped from the vessel into the cavity is introduced to the passage formation portion via the introduction portion.
 3. The industrial equipment according to claim 1, wherein a cross-sectional area of the passage formation portion, is perpendicular to a bottom surface of the passage formation portion, is 2000 mm² or more and 20000 mm² or less.
 4. The industrial equipment according to claim 1, wherein, in a cross section of the passage formation portion perpendicular to an extending direction thereof, a horizontal length of the cross section is 1 to 200 times a vertical length of the cross section.
 5. The industrial equipment according to claim 2, wherein the introduction portion is a through hole formed in a side wall of the passage formation portion facing the vessel.
 6. The industrial equipment according to claim 5, wherein a plurality of the through holes are formed so as to be aligned in the extending direction of the passage formation portion.
 7. The industrial equipment according to claim 1, wherein a plurality of passage formation portions are installed in the industrial equipment so as to be aligned side by side in a width direction thereof.
 8. The industrial equipment according to claim 1, wherein the plurality of passage formation portions are stacked in the vertical direction.
 9. The industrial equipment according to claim 1, wherein a ceiling portion of the passage formation portion is provided with a plurality of protrusions formed inside the passage formation portion.
 10. The industrial equipment according to claim 1, wherein a floor portion of the passage formation portion is provided with a protrusion formed inside the passage formation portion.
 11. The industrial equipment according to claim 1, wherein a covering member is installed on a top of the passage formation portion existing at the highest position in the vertical direction.
 12. The industrial equipment according to claim 1, wherein a protruding portion is formed on a top of the passage formation portion at the highest position in the vertical direction. 